Direct Top Up can be used to add service to any Metro by T-Mobile Prepaid plan. All Metro by T-Mobile plans include unlimited talk & text and high-speed data (including plans with unlimited) with access to T-Mobile’s 5G Network at no extra cost. Select plans include Google One Hotspot and more all at a price you’ll love. The $4 convenience fee plus tax (where applicable) is a charge for processing your payment or converting your payment into a Payment PIN so that it can be applied to your Metro by T-Mobile account.